Christmas tree stand



FIG. 1 is a top, front, and right side perspective view of a Christmas tree stand showing my new design;

FIG. 2 is a top, rear, and left side perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and

FIG. 5 is a left side elevational view thereof. 

The ornamental design for a Christmas tree stand, as shown and described. 